I guess I should have been clearer about my rationale for bugging you
on this Ian: I reckon the Web of documents is transitioning to a more
general Web of data. For things to go smoothly HTML should at least
have minimal support for describing things in a form computers can
understand (yup, in many ways this is orthogonal to what browsers
currently do).
The best mechanism I know of for this kind of extensibility on top of
the doc markup, to leave the door open for innovation, is URI-based
namespaces. If you have another approach up your sleeve that will
fulfil the same role, great! Let's see it.
Cheers,
Danny.